Fix: ui- rendering issue on Pr-preview link

[saurabhraghuvanshii]

Description

gatsby-config.js

• In CI, the workflow sets PATH_PREFIX to the folder segment where the preview will live (e.g. pr-preview/pr-5).
• Gatsby reads pathPrefix: the leading / turns that into a path such as /pr-preview/pr-5.
• With npm run build:preview (gatsby build --prefix-paths), Gatsby rewrites asset and page links so they start with that prefix (e.g. /pr-preview/pr-5/app-….js).
• pathPrefix is only set when PATH_PREFIX is set, so a normal production build (no env var) stays a root deploy and is unchanged.

the workflow make the build which subpath the preview uses; gatsby-config.js applies that as pathPrefix so every script and style loads from the right place and the page can run as a full interactive app.

This PR fixes #

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